Improvement in sharpening-machines



J. C. McLAREN & Cl BL COVENTRY.

SHARPENING-MACHINE;

Patented Aug. 22, 1876 WITNESSES,

N4 PETERS, FHOTO-LITHDGRA PHER, WASHINGTON, D C.

JAMES C. MGLAREN AND CHARLES B. COVENTRY, OF SAN FRANCISCO, GAL.

IMPROVEMENT IN SHARPENlNG-MACHINES.

Specification forming part of Letters Patent No. 181,275 dated August22, 1876; application filed June 17, 1876.

the handle; G, the adjustable crank-arm D,

the slot for adjusting the crank; E, the setscrew; F,the'connecting-bar; G, the slotted movable set-block; H, the guide forthe movable set-blook; J, the bed bar or frame; K, the sliding frame; L,the guide-posts for the sliding frame; M, the grinding-wheel; N, thedriving-belt; O, the small driving-pulley; P, the slot to allow themotion of the sliding bar of the crank; R, the pin to attach theconnecting-rod F with the sliding set-block;

. S, the crank-pin; T, the main driving-shaft;

V, the main sleeve-journal bearing for the main shaft; W, thesleeve-journal bearing for the grinding-shaft X. The set-pin Z isdesigned to set the sliding frame K upon the bed bar or frame J, thebreast-plate to be held against the breast when the machine-is beingoperated. I

The following is the operation of the same As the hand-wheel A isrevolved, motion is imparted to the pulley O, which, being on the shaftX, (which operates in the sleeve W,) gives motion to the grinding-wheelM, which is also attached to the shaft X.

The crank 0, being attached to the shaft T, which operates in the sleeveV, which vforms a part of the sliding frame K, causes the same toreciprocate, when the sliding setblock G is set fast to the frame J bymeans of the set-screw a, (the set-pin Z being withdrawn to allow thesame to move.) Thus, the frame K being moved back and forth the depth ofthe sickle-tooth, (to which it is adjusted by adjusting the crank O, asindicated by the slot D,) moves the grinding-wheel M along the wholecutting-edge of the sickletooth, thus saving the motion of the body ofthe operator necessary to effect the same.

In case the grinding-wheel is designed to be held still in one position,as. would be the case when a nick is required to be ground out of atooth, or a portion of the tooth ground of at one point, then theset-screw a is withdrawn, freeing the sliding set-block G, and allowingthe same to reciprocate, sliding upon the guide-post H, maintaining thegrind-- lug-wheel M steadily in one position; and in case it isnecessary to use it continuously in a fixed position, then the compoundslotted crank O is adjusted to bring the crank-pin S directly in linewith the center or axis of the shaft T, thus entirely neutralizing theeffect of the crank 0, while the set-pin Z holds the frame solidlytogether, and gives the effect of a solid machine. The slot 1? andguide-posts L L represent the attachment of the sliding frame K with thebed-frame J, so as to allow the required reciprocating movement.

The advantages of this over all other sicklegrinding machines is seen inits entire adjustability, which adapts it to any kind of work requiredin sharpening sickle-teeth in the field, or withoutdetaching the sicklefrom the reaper or mower.

The combination of the adjustable crank with the sliding frame is usedto reciprocate the same, or when the same is made stationary it is thereneutralized either by freeing the sliding setblock G and allowing ittoslide upon the guide-post H, or by bringing the crank-pin on the axisof the main drivingshaft T; and the sliding set-block G is either usedas the fulcrum for the lever-connecting bar or rod F, by which the frameK is reciprocated or moved backward and forward, or is allowed to slide,as has been shown.

The machine can be adjusted to any angle or bevel, being controlledentirely by the hand and body of the operator. The grinding-shaft X isfixed in-position in relation to the sliding frame K as it revolves inthe sleeve W, which has no adjustment in relation to the sliding frameK.

e t i 1,215

What we claim, and desire to secure by Letcrank O, the connecting-rod F,and sliding setters Patent, isblock Gr, when constructed and operated,sub- The sick lesharpener, to operate either stantially as and for thepurposes set forth. fixed or reciprocating, composed of the bedframe J,having the hearing-plate Y, the han- JAMES C. MGLAREN.

dle B, the guide-post H, and the guide-posts CHARLES B. COVENTRY. L andL, and the reciprocating frame K, hav- Attest:

ing the sleeves V and W, the slot P, and set- J. H. REDSTONE,

pin Z, in combination with the adjustable WALTER HYDE.

